Source: wikibot/logarithmically-concave-sequence
= Logarithmically concave sequence
{wiki=Logarithmically_concave_sequence}
A sequence \\((a_n)_\{n=1\}^\\infty\\) is said to be logarithmically concave if for all \\(n \\geq 1\\), the following condition holds: \\\[ a_n^2 \\geq a_\{n-1\} \\cdot a_\{n+1\} \\\] This condition can also be equivalently expressed using logarithms.